Ok, I understand better now... 'was not aware of those very specific MacBookPro updates.
I don't believe trying to add the PCI id 10de:0407 to whatever kext is required at all. Your GeForce 8600M GT carries the same id as the nVidia GPU of the MacBookPro3,1. If you look into the Info.plist file of the NV50Hal kext, you should notice the presence of support for 0x040010de with mask 0xfff0ffff. That covers your GPU.
I guess you probably need to inject the nVidia properties of your nVidia card into Tiger, either through your bootloader or through a DSDT patch or through an injector kext (like NVInject) if you still manage to find one after all those years. Those would basically inject those necessary properties like NVDA,Parent, ports description, etc. You'll find plenty of examples on Hackintosh forums or here in the Dortania documentation.